rectus femoris
The patella - a sesamoid bone
Submitted by admin on July 3, 2008 - 6:44am.The patella (kneecap) is a 'sesamoid bone'. A sesamoid bone is a bone that develops in a muscle tendon, rather than being attached by ligaments to another bone. The tendon in which the patella develops is the tendon of the quadriceps muscle, the big muscle that makes up the bulk of your 'lap'.